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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LF13331 Fiches technique(PDF) 9 Page - National Semiconductor (TI) |
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LF13331 Fiches technique(HTML) 9 Page - National Semiconductor (TI) |
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9 / 18 page  Application Hints (Continued) LEAKAGE CURRENTS The drain and source leakage currents, in both the ON and the OFF states of each switch, are typically less than 1 nA at 25˚C and less than 100 nA at 125˚C. As shown in the typical curves, these leakage currents are Dependent on power supply voltages, analog voltage, analog current and the source to drain voltage. DELAY TIMES The delay time OFF (t OFF) is essentially independent of both the analog voltage and temperature. The delay time ON (t ON) will decrease as either (VCC−VA) decreases or the tem- perature decreases. POWER SUPPLIES The voltage between the positive supply (V CC) and either the negative supply (V EE) or the reference supply (VR) can be as much as 36V. To accommodate variations in input logic refer- ence voltages, V R can range from VEE to (VCC−4.5V). Care should be taken to ensure that the power supply leads for the device never become reversed in polarity or that the device is never inadvertently installed backwards in a test socket. If one of these conditions occurs, the supplies would zener an internal diode to an unlimited current; and result in a de- stroyed device. SWITCHING TRANSIENTS When a switch is turned OFF or ON, transients will appear at the load due to the internal transient voltage at the gate of the switch JFET being coupled to the drain and source by the junction capacitances of the JFET. The magnitude of these transients is dependent on the load. A lower value R L produces a lower transient voltage. A negative transient oc- curs during the delay time ON, while a positive transient oc- curs during the delay time OFF. These transients are rela- tively small when compared to faster switch families. DISABLE NODE This node can be used, as shown in Figure 5, to turn all the switches in the unit off independent of logic inputs. Normally, the node floats freely at an internal diode drop ( ≈0.7V) above V R. When the external transistor in Figure 5 is saturated, the node is pulled very close to V R and the unit is disabled. Typi- cally, the current from the node will be less than 1 mA. This feature is not available on the LF11201 or LF11202 series. Typical Applications DS005667-6 FIGURE 5. Disable Function Sample and Hold with Reset DS005667-42 www.national.com 9 |
Numéro de pièce similaire - LF13331 |
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Description similaire - LF13331 |
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